132 PROCEEDINGS OF THE AMERICAN ACADEMY. 



In the latter treatment the acid solution when neutralized with baric 

 carbonate gave a barium salt in clusters of needles, sparingly soluble in 

 water, doubtless the barium salt of cymol-sulphonic acid, although the 

 quantity obtained was too small for analysis. 



After this prolonged treatment with the fuming acid, the specific gravity 

 was found to be 0.7467, substantially the same as in the previous deter- 

 minations, and practically the same as the specific gravity of the decane 

 boiling at 1G3°. 



The molecular weight of this hydrocarbon, as determined by the Beck- 

 mann method, using benzol as a solvent, was found to be 144; since the 

 formula C1QH22 requires 142, this determination leaves no doubt that 

 this body is decane, and not a higher homologue. 



The chlorine derivatives of the decane 173°-174° were formed in the 

 same manner as those of its isomer. 32 grams of the purified distillate 

 was allowed to absorb 9 grams of chlorine, and the product was fractioned 

 in vacuo. After the fourth distillation a small quantity collected at 130° 

 -140°, which gave percentages of carbon, hydrogen, and chlorine required 

 for monochlordecane : — 



I. 0.2082 gram of the product gave 0.1699 gram AgCl. 

 II. 0.2003 of the product gave 0.5038 gram CO2, and 0.2150 gram HgO. 



Found. 

 I. II. 



68.61 

 11.93 

 20.19 



The specific gravity of this chlordecane at 20° was 0.8874, a value 

 somewhat lower than the specific gravity of the chlordecane formed from 

 163° decane, 0.8914. After the study of its other properties not enough 

 of this chlordecane remained for a determination of its boiling point under 

 atmospheric pressure. As the specific gravity of the chlorine derivative of 

 petroleum decane, Lemoine * gave 0.908. This value must have been 

 obtained from decane boiling at 162°, since the French chemists have 

 never recognized a decane in petroleum boiling at 173°. It was probably 

 obtained in an impure product, since it is very considerably higher than 

 our determination, which was made, as already shown, in chlordecane from 

 well purified decane. 



In continuing the vacuum distillation of the chlorine products from 



* Bull. Soc. Chim., XLI. 165. 



